I would keep the d10, or if I changed it I would use 2d6. Old school D&D is not as obsessed with a single die mechanic as the Hasbro versions. Jonathan Tweet borrowed that from ArM2 when he created the Hasbro version of D&D. The universal d20 is an aspect of the Hasbro game and Pathfinder that I strong;y dislike, hence why I stick with older editions.
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